CNC Milling · 3, 4 & 5 Axis

Complex Geometry.Controlled Production.

Precision CNC milling for critical prototypes and repeatable production—engineered around your geometry, tolerance, and delivery requirements.

±0.02 mm tolerance
Up to 1000 × 700 mm
No minimum quantity
CNC milling a precision metal component
Live machining · Aluminum

Start with your CAD file

Upload. Configure. Get your price.

STEP or STP

Encrypted · Max. 50 MB

The process

What is CNC milling?

CNC milling is a subtractive manufacturing process that shapes a solid block of material with rotating cutting tools. Computer-controlled motion enables repeatable production of precise features.

A STEP model is converted into toolpaths in CAM software. The milling machine follows those paths to remove material and produce the specified geometry and surface finish.

The process works with metals, plastics, and other machinable materials. It is widely used for prototypes and production components across automotive, aerospace, medical, electronics, and industrial applications.

Organized CNC machining facility with multiple production centers

Controlled production

Capacity organized around repeatability.

Machine capability

The right axis strategy for every geometry.

Axis count determines how much of a complex part can be reached in a single setup—affecting accuracy, surface finish, lead time, and cost.

Three-axis CNC milling a fixed aluminum workpiece
3Axis

3-Axis CNC

X · Y · Z linear motion

Standard

The cutting tool moves along the X, Y, and Z axes while the part remains fixed. This is the standard configuration for planar surfaces, pockets, drilling, and contouring.

Planar and prismatic geometries
Pocket, slot, and contour milling
Drilling and tapping
Four-axis CNC milling with a horizontal rotary indexer, cylindrical workpiece, and vertical spindle
4Axis

4-Axis CNC

X · Y · Z + A rotary axis

Advanced

A rotary indexer turns the workpiece around its horizontal A axis while the spindle performs X, Y, and Z cutting moves. This enables machining around cylindrical parts and across multiple faces with fewer setups.

Cylindrical and rotational geometries
Circumferential slots and features
Fewer setups and reduced alignment risk
Five-axis CNC machining center cutting a jet-engine turbine impeller
5Axis

5-Axis CNC

X · Y · Z + A + C rotary axes

Premium

Five-axis machining combines three linear axes with two rotary movements to reach complex surfaces and reduce repositioning.

Organic and highly complex geometries
Access to most surfaces in one setup
Improved surface quality with shorter tools

What we machine

CNC milling operations.

From clean datum surfaces to complex freeform geometry, each operation is selected around part function and repeatability.

01Datum surfaces

Face Milling

Creates a flat, smooth reference surface on raw stock.

02Internal features

Pocket Milling

Machines closed or open pockets for housings, covers, and structural parts.

03Profiles

Contour Milling

Machines external profiles and curved surfaces for complex or organic geometries.

04Threads & holes

Drilling & Tapping

Produces precision holes and standard tapped features from M3 through M24.

05Assembly features

T-Slots & Dowel Holes

Creates locating and fastening features for precision assemblies.

06Freeform geometry

3D Surface Machining

Machines freeform curved surfaces used in molds, patterns, and ergonomic parts.

Production envelope

Capability without ambiguity.

Representative CNC milling capabilities. Final limits depend on geometry, material, and order requirements.

±0.02 mm
Precision Tolerance
1000x700 mm
Maximum Size
1+
Order Quantity
3-4-5 axis
Axis Capability
Ra 0.8 µm
Fine Surface Finish

Material library

Engineering materials, ready to machine.

Design for machining

Better decisions before the spindle starts.

Use these guidelines to improve manufacturability and reduce unnecessary machining time and cost.

Review your design with a quote
01
Avoid

Avoid Deep, Narrow Pockets

Pockets deeper than a 4:1 depth-to-width ratio can cause tool deflection and chatter. Keep pocket depth near three times the width when possible.

02
Recommended

Add Radii to Internal Corners

Round cutting tools cannot create perfectly sharp internal corners. Use an internal radius at least half the tool diameter.

03
Avoid

Avoid Unnecessarily Tight Tolerances

Apply tight tolerances only to functionally critical dimensions and use an appropriate general tolerance elsewhere.

04
Recommended

Use Standard Hole Sizes

Standard drill and thread sizes can be produced with readily available tooling, reducing cost and setup time.

05
Avoid

Avoid Very Thin Walls

Thin walls can bend or chatter during machining. As a starting point, maintain at least 1 mm for metals and 1.5 mm for plastics.

06
Recommended

Define Datum Surfaces

Clearly identify datum and setup references on the technical drawing so dimensions are measured from the intended origin.

Frequently asked
questions

Review common questions about CNC Milling. Contact our team when your drawing, material, or inspection requirements need project-specific review.

Can’t find your answer? Send our team the project details and technical files for review.

→ support@partgo.us
What is the difference between 3-axis and multi-axis milling?
Three-axis milling suits many prismatic parts. Multi-axis equipment can reduce setups and reach angled or complex features, depending on geometry.
How should I specify surface roughness?
Show required Ra values only on functionally important surfaces and identify any measurement or inspection requirements on the drawing.
What files should I provide?
Provide a STEP model and a PDF technical drawing for critical dimensions, tolerances, threads, finishes, and inspection requirements.
How is manufacturability reviewed?
The part is reviewed against its geometry, material, quantity, process, tolerance, finish, and inspection requirements before availability and pricing are confirmed.
What affects the quote?
Material, setup time, cycle time, quantity, geometry, tolerances, inspection, finishing, and logistics can all affect the quote.

Your next part starts here

Start building
better parts.

From first prototype to repeat production, tell us what you're building. Our manufacturing team will help you plan the fastest path forward.

Let's get started

By submitting this form, you confirm that you have read and understood PartGo's Privacy Notice.

Your CAD files and project details remain confidential.
Talk directly with a manufacturing specialist